Supraventricular tachycardia is MOST accurately defined as:
A) any tachycardic rhythm with a heart rate greater than 130 beats/min and absent P waves.
B) a tachycardic rhythm originating from a pacemaker site above the level of the ventricles.
C) an irregular tachycardic rhythm that originates just below the AV junction.
D) a regular tachycardic rhythm between 150 and 180 beats/min with P waves buried in the QRS complexes.
Answer: B) a tachycardic rhythm originating from a pacemaker site above the level of the ventricles.
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